CN109707999A - A kind of multi-arm intelligence super-low liquid unloading unit and processand - Google Patents
A kind of multi-arm intelligence super-low liquid unloading unit and processand Download PDFInfo
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- CN109707999A CN109707999A CN201910122221.9A CN201910122221A CN109707999A CN 109707999 A CN109707999 A CN 109707999A CN 201910122221 A CN201910122221 A CN 201910122221A CN 109707999 A CN109707999 A CN 109707999A
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- 239000007788 liquid Substances 0.000 title claims abstract description 55
- 239000012071 phase Substances 0.000 claims abstract description 95
- 239000007791 liquid phase Substances 0.000 claims abstract description 61
- 239000012530 fluid Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 22
- 230000005501 phase interface Effects 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims description 112
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000003345 natural gas Substances 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000002309 gasification Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
The invention discloses a kind of multi-arm intelligence super-low liquid unloading units, including storage tank and multiple units of unloading, unit of each unloading includes tank car, cryogenic pump sled and pressurization gasifier, tank car liquid phase interface is provided on tank car, tank car gas phase interface and boost fluid interfaces, cryogenic pump sled includes unloading oil filling riser liquid phase arm, it unloads pipeline, unloading oil filling riser gas phase arm and gas phase pipeline, tank car liquid phase interface is connect by unloading oil filling riser liquid phase arm with pipeline one end of unloading, the pipeline other end of unloading is connect with storage tank liquid phase general pipeline, tank car gas phase interface is connect by unloading oil filling riser gas phase arm with gas phase pipeline one end, the gas phase pipeline other end is connect with storage tank gas phase general pipeline, it unloads and is provided with liquid phase branch on pipeline.The invention also discloses carry out the technique that super-low liquid is unloaded using the device.Using the device of the invention and technique, certain pressure difference is able to maintain that between tank car and storage tank during unloading, the condition that unloading pump operates normally both has been ensure that, has also improved and unload vehicle speed.
Description
Technical field
It unloads technical field the invention belongs to super-low liquid, and in particular to a kind of multi-arm intelligence super-low liquid is unloaded dress
It sets and processand.
Background technique
Currently, super-low liquid LNG tank car is unloaded, the mode of unloading is unloaded or pumped to general use from pressurization, unloads turner from pressurization
Skill is simple, and since tank car liquid level is low, pressurization time is long, and the time of unloading is long, and 50 cubes of groove tank time that needs to unload is 3~4 small
When；If adopting discharge by pump, due to being limited by groove tank car outlet caliber, the liquid outlet of current country's automotive groove tank car standard
Caliber is DN50, limits the flow of LNG, due to the special nature of super-low liquid, is easy to produce cavitation, causes to use
Unloading pump, which is unloaded, can not be greatly shortened the time of unloading.The LNG peak regulation station scale of domestic construction is increasing at present, largely
LNG use Automobile Transportation, how Quick-unloading the problem of it is urgently to be resolved.
It either unloads from pressurization or unloading pump is unloaded, pressure difference during unloading in tank car and storage tank is without Faville
Hold relative constant, to cause to unload, vehicle speed is slow, and unloading pump is failed due to cavitation erosion, cannot play due effect.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of multi-arm intelligence
Super-low liquid unloading unit.Device time of unloading is short, and 50 cubes of tank car time that needs to unload is in 1.5 hours, optimal
Time of unloading can reach 50 minutes to 70 minutes, so that tradition time of unloading is foreshortened to 1/3 or so, effectively increases efficiency of unloading.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of multi-arm intelligence super-low liquid is unloaded
Device, which is characterized in that including storage tank and multiple units of unloading, each unit of unloading include tank car, cryogenic pump sled and
It is pressurized gasifier, is provided with tank car liquid phase interface, tank car gas phase interface and boost fluid interfaces, the cryogenic pump on the tank car
Sled includes unloading oil filling riser liquid phase arm, pipeline of unloading, unloading oil filling riser gas phase arm and gas phase pipeline, and the tank car liquid phase interface is by unloading
Vehicle oil filling riser liquid phase arm is connect with the one end for pipeline of unloading, and the other end for pipeline of unloading is connect with storage tank liquid phase general pipeline, the tank car
Gas phase interface is connect by unloading oil filling riser gas phase arm with one end of gas phase pipeline, the other end and storage tank gas phase general pipeline of gas phase pipeline
Connection, be interfaced between storage tank liquid phase general pipeline from tank car liquid phase on the pipeline of unloading be disposed with first pressure sensor,
Unloading pump, the first temperature sensor, second pressure sensor and the first valve, it is described to unload on pipeline and be located at second pressure biography
Position between sensor and the first valve is provided with liquid phase branch, one end of the liquid phase branch and piping connection of unloading, liquid phase
The other end of branch is connect with the inlet of pressurization gasifier, and the gas outlet of the pressurization gasifier passes through the second pipeline and gas phase
Piping connection, the boost fluid interfaces are connect by the first pipeline with liquid phase branch, and the liquid phase branch road is provided with second
Valve, the position on the gas phase pipeline close to tank car gas phase interface are provided with second temperature sensor and third pressure sensing
Device；Gas phase branch is provided on the gas phase pipeline, one end of the gas phase branch connects with gas phase pipeline, gas phase branch it is another
One end connects tank car gas phase pipe, and the tank car gas phase pipe connects with the tank car gas phase interface for unit of each unloading, gas phase branch
On be provided with third valve.
Above-mentioned a kind of multi-arm intelligence super-low liquid unloading unit, which is characterized in that on the gas phase pipeline and be located at
Position between gas phase branch and storage tank gas phase general pipeline is provided with the 4th valve.
A kind of above-mentioned multi-arm intelligence super-low liquid unloading unit, which is characterized in that it further include control system, the control
System processed includes PLC controller and the power supply for the power supply of each power unit, the first pressure sensor of the unit of unloading,
First temperature sensor, second pressure sensor, second temperature sensor and third pressure sensor are defeated with PLC controller
Enter end connection, unloading pump, the first valve, the second valve, third valve and the 4th valve of the unit of unloading are and PLC
The output end of controller connects.
Above-mentioned a kind of multi-arm intelligence super-low liquid unloading unit, which is characterized in that close to storage on the pipeline of unloading
The position of tank liquid phase general pipeline is provided with first check-valve.
Above-mentioned a kind of multi-arm intelligence super-low liquid unloading unit, which is characterized in that the liquid phase branch and be located at the
The downstream of two valves is provided with second check-valve.
In addition, carrying out the technique that super-low liquid is unloaded, feature using above-mentioned device the present invention also provides a kind of
It is, which includes:
Step 1: carrying out nitrogen displacement to the air in each pipeline of device；
Step 2: then super-low liquid in tank car is introduced by unloading pipeline and the first pipeline enters liquid phase branch
Tank car is pressurized in pressurization gasifier, is controlled and is entered by the opening and closing degree of the second valve of liquid phase branch road in pressurization
It is pressurized the flow of the super-low liquid of gasifier, the pressure in tank car constantly increases, when the slot that first pressure sensor detects
Interior pressure P1Reach 0.4MPa~0.8MPa, while when dynamic amount Δ P meets the following conditions, opening the first valve, to unloading
Vehicle pump is pre-chilled:
Ps=(λ L/d) ρ v2/2；
Δ P=P1- P=P2-1+Ps；
In formula:
P2-1--- theoretical pressure difference, unit MPa；
P --- the pressure in storage tank, unit MPa；
Ps--- the pressure loss, unit MPa；
The density of ρ --- fluid, unit kg/m3；
ν12--- the speed of tank car liquid outlet fluid, unit m/s；
ν22--- the speed of unloading pump inlet fluid, unit m/s；
ν --- pipeline fluid speed, unit m/s；
gZ1--- the position energy of tank car liquid outlet, unit m2/s2；
gZ2--- the position energy of unloading pump inlet, unit m2/s2；
λ --- pipeline frictional resistant coefficient；
L --- duct length, unit m；
D --- internal diameter of the pipeline, unit m；
When meeting following two condition simultaneously, starting unloading pump is unloaded:
Dynamic amount Δ P=P1- P=P2-1+Ps；
And the first temperature T that detects of temperature sensor1<-120℃；
While unloading, by adjusting the opening and closing degree of the second valve, keep some ultra-low geothermal liquid flowed out in tank car logical
It crosses liquid phase branch to be introduced into tank car pressurization in pressurization gasifier, and controls pressurization gasifier exit second temperature sensor and detect
Temperature meet the following conditions:
P3=∑ yiPci；
Tc=∑ yiTci；
Δ T=T2-Tc；
Δ T is 278K~298K；
In formula: Ai, Bi, Ci, yi are constant, look into " deep cooling handbook "；
P3--- the pressure that third pressure sensor detects, unit MPa；
Pci--- Various Components In Natural Gas pressure caused by saturation state steam, unit MPa；
Tci--- Various Components In Natural Gas possessed temperature in saturation state, unit K；
Tc——P3The saturation temperature of lower super-low liquid, unit K；
T2--- the temperature that second temperature sensor detects；
It maintains dynamic to measure Δ P simultaneously and meets the following conditions:
Dynamic amount Δ P=P1- P=P2-1+Ps。
Above-mentioned technique, which is characterized in that further include: when storage tank is storage tank with pressure, before step 2, nitrogen displacement
The pressure difference for first judging storage tank and tank car after the completion, when the pressure P in storage tank is greater than the tank car that first pressure sensor detects
Interior pressure P1When, the 4th valve is opened, the pressure of tank car and storage tank is balanced by gas phase pipeline, after pressure balance, is closed
4th valve.
Above-mentioned technique, which is characterized in that the storage tank with pressure is the storage tank that finger pressure is 0.4MPa~1.0MPa.
Above-mentioned technique, which is characterized in that further include: pass through the tank car pressure of each unit of unloading of detection during unloading
The pressure balance between each tank car is controlled, when the tank car hypotony of some unit of unloading, opens pressure higher slot
The third valve of unit of unloading where vehicle, the portion gas in tank car for keeping pressure high is successively through gas phase pipeline, gas phase branch
Enter in the tank car of the unit of unloading of other hypotony with tank car gas phase pipe, the tank car of hypotony is pressurized.
Above-mentioned technique, which is characterized in that further include: unloading pump and respective valves are closed after unloading, and open the 4th
Valve balances the pressure of tank car and storage tank by gas phase pipeline.
Compared with the prior art, the present invention has the following advantages:
1, compared with unloading with existing from pressurization, the device of the invention time of unloading is short, when 50 cubes of tank car needs to unload
Between in 1.5 hours, the optimal time of unloading be can reach 50 minutes to 70 minutes, so that tradition time of unloading is foreshortened to 1/3 or so, have
Effect improves efficiency of unloading.
2, compared with conventional pump is unloaded, apparatus of the present invention can effectively avoid the hair of cavitation in unloading pump operational process
Raw, vehicle speed is unloaded in raising.
3, opposite to unload from pressurization and pump is unloaded, the advantages of apparatus of the present invention be during unloading tank car and storage tank it
Between be able to maintain that certain pressure difference, pass through acquisition tank car and storage tank pressure and pressurization gasifier exit temperature data, feed back
To PLC controller, the aperture of PLC controller control valve adjusts the flow for entering the super-low liquid of pressurization gasifier, thus
Pressure difference in control tank car and storage tank is always ensured that unloading pump is in optimal operating status, and reduction is unloaded in operational process
Cavitation and rate of breakdown, to improve efficiency of unloading.
4, the multiple units of unloading of present invention setting are, it can be achieved that multiple tank cars while unloading；Each unit gas phase branch of unloading
It is connect with tank car gas phase pipe, and tank car gas phase pipe connects with the tank car gas phase interface for unit of each unloading, during unloading
Pressure balance between each tank car is controlled by detecting the tank car pressure of each unit of unloading, when the tank car of some unit of unloading
When hypotony, the gas in the high tank car of pressure can be sent into other hypotony by gas phase branch and tank car gas phase pipe
It is pressurized in tank car, shortens the pressurization time of tank car and the pre-coo time of unloading pump, is improved and is unloaded vehicle speed and unload
Vehicle efficiency.
5, the advantages of opposite pressurization is unloaded certainly and pump is unloaded, apparatus of the present invention, which also resides in control by valve, enters pressurization gas
Change the ultralow temperature gas flow of device, to control the gasification temperature of pressurization gasifier exit, had both realized and low-temperature tanker is pressurized, together
When prevent overheat gas enter tank car, cause super-low liquid in tank car largely to gasify, reduction unload during flash steam arrange
High-volume, reach energy-efficient effect, also improve the operational safety for the process of unloading.
With reference to the accompanying drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of apparatus of the present invention.
Fig. 2 is the structural schematic diagram of a unit of unloading of the invention.
Fig. 3 is the connection relationship diagram of of the invention one unload unit and PLC controller.
1-tank car；2-cryogenic pumps sled；3-unloading oil filling riser liquid phase arms；
4-unload pipeline；5-first pressure sensors；6-PLC controllers；
7-unloading pumps；8-the first temperature sensor；9-second pressure sensors；
10-the first valve；11-storage tank liquid phase general pipeline；12-storage tank gas phase general pipeline；
13-the second valve；14-gas phase branches；15-third valves；
16-the four valve；17-liquid phase branches；18-gas phase pipelines；
19-the first pipeline；20-pressurization gasifiers；21-the second pipeline；
22-second temperature sensors；23-third pressure sensors；24-unloading oil filling riser gas phase arms；
25-tank car gas phase pipes；26-have first check-valve；27-second check-valves.
Specific embodiment
Embodiment 1
As depicted in figs. 1 and 2, multi-arm intelligence super-low liquid unloading unit of the invention, including storage tank and multiple unload
Unit, each unit of unloading include tank car 1, cryogenic pump sled 2 and pressurization gasifier 20, are provided with tank car on the tank car
Liquid phase interface, tank car gas phase interface and boost fluid interfaces, the cryogenic pump sled 2 includes unloading oil filling riser liquid phase arm 3, pipeline of unloading
4, unloading oil filling riser gas phase arm 24 and gas phase pipeline 18, the tank car liquid phase interface pass through unloading oil filling riser liquid phase arm 3 and pipeline 4 of unloading
One end connection, the other end for pipeline 4 of unloading connect with storage tank liquid phase general pipeline 11, and the tank car gas phase interface passes through unloading oil filling riser
Gas phase arm 24 is connect with one end of gas phase pipeline 18, and the other end of gas phase pipeline 18 is connect with storage tank gas phase general pipeline 12, described to unload
Be interfaced between storage tank liquid phase general pipeline 11 on vehicle pipeline 4 from tank car liquid phase be disposed with first pressure sensor 5, unloading pump 7,
First temperature sensor 8, second pressure sensor 9 and the first valve 10, it is described to unload on pipeline 4 and be located at second pressure sensing
Position between device 9 and the first valve 10 is provided with liquid phase branch 17, one end of the liquid phase branch 17 and the company of pipeline 4 of unloading
It connects, the other end of liquid phase branch 17 is connect with the inlet of pressurization gasifier 20, and the gas outlet of the pressurization gasifier 20 passes through
Second pipeline 21 is connect with gas phase pipeline 18, and the boost fluid interfaces are connect by the first pipeline 19 with liquid phase branch 17, institute
It states and is provided with the second valve 13 on liquid phase branch 17, the position on the gas phase pipeline 18 close to tank car gas phase interface is provided with the
Two temperature sensors 22 and third pressure sensor 23；Gas phase branch 14, the gas phase branch are provided on the gas phase pipeline 18
The one end on road 14 connects with gas phase pipeline 18, and the other end of gas phase branch 14 connects tank car gas phase pipe 25, the tank car gas phase pipe
25 connect with the tank car gas phase interface for unit of each unloading, and third valve 15 is provided on gas phase branch 14.
In the present embodiment, on the gas phase pipeline 18 and position between gas phase branch 14 and storage tank gas phase general pipeline 12
It is provided with the 4th valve 16.
As shown in figure 3, further including control system in the present embodiment, the control system includes PLC controller 6 and is each
The power supply of power unit power supply, the first pressure sensor 5 of each unit of unloading, the first temperature sensor 8, second pressure
Sensor 9, second temperature sensor 22 and third pressure sensor 23 are connect with the input terminal of PLC controller 6, each described
Unload unit unloading pump 7, the first valve 10, the second valve 13, third valve 15 and the 4th valve 16 with PLC controller 6
Output end connection.
In the present embodiment, the position on the pipeline 4 of unloading close to storage tank liquid phase general pipeline 11 is provided with first check-valve 26.
In the present embodiment, the liquid phase branch 17 and be located at the second valve 13 downstream be provided with second check-valve 27.
The principle of control system of the invention includes: the pressure for the tank car 1 that first pressure sensor 5 detects, the second temperature
The pressurization gasification that 20 Outlet Temperatures of pressurization gasifier and third pressure sensor 23 that degree sensor 22 detects detect
20 outlet pressure data feedback of device to PLC controller 6, PLC controller 6 enters pressurization gas by the aperture control of the second valve 13
Change the flow of the super-low liquid of device 20, and then controls the pressure difference in tank car 1 and storage tank and be always ensured that unloading pump 7 is in best
Operating status, reduce the cavitation and rate of breakdown unloaded in operational process, while improving efficiency of unloading.
Embodiment 2
When storage tank is atmospheric storage tank, i.e., when the pressure P in storage tank is 0.1MPa, carried out using the device of the invention ultralow
The technique that geothermal liquid is unloaded includes:
Step 1: carrying out nitrogen displacement to the air in each pipeline of device；
Step 2: super-low liquid in tank car 1 is by unloading pipeline 4 and the first pipeline 19 enters liquid phase branch 17, so
It is introduced into pressurization gasifier 20 afterwards tank car 1 is pressurized, opened in pressurization by the second valve 13 on liquid phase branch 17
The flow that extent control enters the super-low liquid of pressurization gasifier 20 is closed, the pressure in tank car 1 constantly increases, and works as first pressure
The pressure P in tank car 1 that sensor 5 detects1Reach 0.4MPa~0.8MPa, while when dynamic amount Δ P meets the following conditions,
The first valve 10 is opened, unloading pump 7 is pre-chilled:
Ps=(λ L/d) ρ v2/2；
Δ P=P1- P=P2-1+Ps；
In formula:
P2-1--- theoretical pressure difference, unit MPa；
P --- the pressure in storage tank, unit MPa；
Ps--- the pressure loss, unit MPa；
The density of ρ --- fluid, unit kg/m3；
ν12--- the speed of tank car liquid outlet fluid, unit m/s；
ν22--- the speed of unloading pump inlet fluid, unit m/s；
ν --- pipeline fluid speed, unit m/s；
gZ1--- the position energy of tank car liquid outlet, unit m2/s2；
gZ2--- the position energy of unloading pump inlet, unit m2/s2；
λ --- pipeline frictional resistant coefficient；
L --- duct length, unit m；
D --- internal diameter of the pipeline, unit m；
When meeting following two condition simultaneously, starting unloading pump 7 is unloaded:
Dynamic amount Δ P=P1- P=P2-1+Ps；
And the first temperature T that detects of temperature sensor 81<-120℃；
During unloading, while unloading pump 7 is unloaded, by adjusting the opening and closing degree of the second valve 13, make in tank car
The some ultra-low geothermal liquid of outflow is introduced into pressurization gasifier 20 by liquid phase branch 17 and is pressurized to tank car, and controls pressurization gasification
Device 20 exports the temperature that second temperature sensor 22 detects and meets the following conditions:
P3=∑ yiPci；
Tc=∑ yiTci；
Δ T=T2-Tc；
Δ T is 278K~298K；
In formula: Ai, Bi, Ci, yi are constant, look into " deep cooling handbook "；
P3--- the pressure that third pressure sensor detects, unit MPa；
Pci--- Various Components In Natural Gas pressure caused by saturation state steam, unit MPa；
Tci--- Various Components In Natural Gas possessed temperature in saturation state, unit K；
Tc——P3The saturation temperature of lower super-low liquid, unit K；
T2--- the temperature that second temperature sensor detects；
It maintains dynamic to measure Δ P simultaneously and meets the following conditions:
Dynamic amount Δ P=P1- P=P2-1+Ps；
The pressure balance between each tank car is controlled by detecting the tank car pressure of each unit of unloading during unloading,
When the tank car hypotony of some unit of unloading, the third valve 15 of the unit of unloading where the higher tank car of pressure is opened,
The portion gas in tank car for keeping pressure high successively enters other pressures through gas phase pipeline 18, gas phase branch 14 and tank car gas phase pipe 25
In the tank car of the too low unit of unloading of power, the tank car of hypotony is pressurized；
Step 3: closing unloading pump 7 and respective valves after unloading, the 4th valve 16 is opened, gas phase pipeline 18 is passed through
Balance the pressure of tank car 1 and storage tank.
Embodiment 3
When storage tank is storage tank with pressure, i.e., when the pressure in storage tank is 0.4MPa~1.0MPa, using the device of the invention
Carrying out the technique that super-low liquid is unloaded includes:
Step 1: carrying out nitrogen displacement to the air in each pipeline of device；
Step 2: the pressure difference of storage tank Yu tank car 1 is first judged, when the pressure P in storage tank is examined greater than first pressure sensor 5
The pressure P in tank car 1 measured1When, the 4th valve 16 is opened, the pressure of tank car 1 and storage tank is balanced by gas phase pipeline 18, to
After pressure balance, the 4th valve 16 is closed；Super-low liquid in tank car 1 is by unloading pipeline 4 and the first pipeline 19 enters liquid
Then phase branch 17 is introduced into pressurization gasifier 20 and is pressurized to tank car 1, passes through on liquid phase branch 17 second in pressurization
The opening and closing degree control of valve 13 enters the flow of the super-low liquid of pressurization gasifier 20, and the pressure in tank car 1 constantly increases,
Pressure P in the tank car 1 that first pressure sensor 5 detects1Reach 0.4MPa~0.8MPa, while dynamic amount Δ P meets
When the following conditions, the first valve 10 is opened, unloading pump 7 is pre-chilled:
Ps=(λ L/d) ρ v2/2；
Δ P=P1- P=P2-1+Ps；
In formula:
P2-1--- theoretical pressure difference, unit MPa；
P --- the pressure in storage tank, unit MPa；
Ps--- the pressure loss, unit MPa；
The density of ρ --- fluid, unit kg/m3；
ν12--- the speed of tank car liquid outlet fluid, unit m/s；
ν22--- the speed of unloading pump inlet fluid, unit m/s；
ν --- pipeline fluid speed, unit m/s；
gZ1--- the position energy of tank car liquid outlet, unit m2/s2；
gZ2--- the position energy of unloading pump inlet, unit m2/s2；
λ --- pipeline frictional resistant coefficient；
L --- duct length, unit m；
D --- internal diameter of the pipeline, unit m；
When meeting following two condition simultaneously, starting unloading pump 7 is unloaded:
Dynamic amount Δ P=P1- P=P2-1+Ps；
And the first temperature T that detects of temperature sensor 81<-120℃；
During unloading, while unloading pump 7 is unloaded, by adjusting the opening and closing degree of the second valve 13, make in tank car
The some ultra-low geothermal liquid of outflow is introduced into pressurization gasifier 20 by liquid phase branch 17 and is pressurized to tank car, and controls pressurization gasification
Device 20 exports the temperature that second temperature sensor 22 detects and meets the following conditions:
P3=∑ yiPci；
Tc=∑ yiTci；
Δ T=T2-Tc；
Δ T is 278K~298K；
In formula: Ai, Bi, Ci, yi are constant, look into " deep cooling handbook "；
P3--- the pressure that third pressure sensor detects, unit MPa；
Pci--- Various Components In Natural Gas pressure caused by saturation state steam, unit MPa；
Tci--- Various Components In Natural Gas possessed temperature in saturation state, unit K；
Tc——P3The saturation temperature of lower super-low liquid, unit K；
T2--- the temperature that second temperature sensor detects；
It maintains dynamic to measure Δ P simultaneously and meets the following conditions:
Dynamic amount Δ P=P1- P=P2-1+Ps；
The pressure balance between each tank car is controlled by detecting the tank car pressure of each unit of unloading during unloading,
When the tank car hypotony of some unit of unloading, the third valve 15 of the unit of unloading where the higher tank car of pressure is opened,
The portion gas in tank car for keeping pressure high successively enters other pressures through gas phase pipeline 18, gas phase branch 14 and tank car gas phase pipe 25
In the tank car of the too low unit of unloading of power, the tank car of hypotony is pressurized；
Step 3: closing unloading pump 7 and respective valves after unloading, the 4th valve 16 is opened, gas phase pipeline 18 is passed through
Balance the pressure of tank car 1 and storage tank.
Xi'an Qin Hua natural gas LNG emergency peak regulation station carries out tank car using the device of the invention and technique and unloads, and strictly presses
According to process flow, the pressure difference of real-time monitoring tank car and storage tank is pressurized gasifier exit pressure and temperature, uses pressurization gasifier
Certain pressure difference is pressurized and guaranteed to keep between tank car and storage tank to tank car, and then guarantees unloading pump in optimal operation shape
State；When the tank car hypotony of some unit of unloading, the portion gas in tank car for keeping pressure high enters other hypotony
Unit of unloading tank car in, it is pressurized.Apparatus of the present invention have highlighted advantage of the invention in the project, by reality
Border continuous operation data statistics, the average time unloaded every time control at 60 minutes, unload vehicle speed and reached design standard.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification, change and equivalence change to the above embodiments, still fall within the technology of the present invention side
In the protection scope of case.
Claims (10)
1. a kind of multi-arm intelligence super-low liquid unloading unit, which is characterized in that including storage tank and multiple units of unloading, Mei Gesuo
Stating unit of unloading includes tank car (1), cryogenic pump sled (2) and pressurization gasifier (20), is provided with tank car liquid phase on the tank car
Interface, tank car gas phase interface and boost fluid interfaces, the cryogenic pump sled (2) includes unloading oil filling riser liquid phase arm (3), pipeline of unloading
(4), unloading oil filling riser gas phase arm (24) and gas phase pipeline (18), the tank car liquid phase interface by unloading oil filling riser liquid phase arm (3) with
It unloads one end connection of pipeline (4), the other end of pipeline of unloading (4) connect with storage tank liquid phase general pipeline (11), the tank car gas phase
Interface is connect by unloading oil filling riser gas phase arm (24) with one end of gas phase pipeline (18), the other end and storage tank of gas phase pipeline (18)
Gas phase general pipeline (12) connection is interfaced between storage tank liquid phase general pipeline (11) on the pipeline of unloading (4) from tank car liquid phase and successively sets
It is equipped with first pressure sensor (5), unloading pump (7), the first temperature sensor (8), second pressure sensor (9) and the first valve
(10), on the pipeline of unloading (4) and the position between second pressure sensor (9) and the first valve (10) is provided with liquid
One end of phase branch (17), the liquid phase branch (17) is connect with pipeline of unloading (4), the other end of liquid phase branch (17) and pressurization
The inlet of gasifier (20) connects, and the gas outlet of pressurization gasifier (20) passes through the second pipeline (21) and gas phase pipeline
(18) it connects, the boost fluid interfaces are connect by the first pipeline (19) with liquid phase branch (17), the liquid phase branch (17)
On be provided with the second valve (13), on the gas phase pipeline (18) close to tank car gas phase interface position be provided with second temperature biography
Sensor (22) and third pressure sensor (23)；It is provided with gas phase branch (14) on the gas phase pipeline (18), the gas phase branch
The one end on road (14) connects with gas phase pipeline (18), and the other end of gas phase branch (14) connects tank car gas phase pipe (25), the slot
Vehicle gas phase pipe (25) connects with the tank car gas phase interface for unit of each unloading, and gas phase branch is provided with third valve on (14)
(15)。
2. a kind of multi-arm intelligence super-low liquid unloading unit according to claim 1, which is characterized in that the gas phase pipe
Position on road (18) and between gas phase branch (14) and storage tank gas phase general pipeline (12) is provided with the 4th valve (16).
3. a kind of multi-arm intelligence super-low liquid unloading unit according to claim 2, which is characterized in that further include control
System, the control system include PLC controller (6) and the power supply for the power supply of each power unit, each unit of unloading
First pressure sensor (5), the first temperature sensor (8), second pressure sensor (9), second temperature sensor (22) and
Three pressure sensors (23) are connect with the input terminal of PLC controller (6), the unloading pump (7) of each unit of unloading, first
Valve (10), the second valve (13), third valve (15) and the 4th valve (16) are connect with the output end of PLC controller (6).
4. a kind of multi-arm intelligence super-low liquid unloading unit according to claim 1, which is characterized in that the pipe of unloading
Position on road (4) close to storage tank liquid phase general pipeline (11) is provided with first check-valve (26).
5. a kind of multi-arm intelligence super-low liquid unloading unit according to claim 4, which is characterized in that the liquid phase branch
Road (17) and be located at the second valve (13) downstream be provided with second check-valve (27).
6. a kind of carry out the technique that super-low liquid is unloaded using device as claimed in claim 2, which is characterized in that the technique
Include:
Step 1: carrying out nitrogen displacement to the air in each pipeline of device；
Step 2: the super-low liquid in tank car (1) enters liquid phase branch by pipeline of unloading (4) and the first pipeline (19)
(17), it is then introduced into pressurization gasifier (20) and tank car (1) is pressurized, pass through on liquid phase branch (17) the in pressurization
The opening and closing degree control of two valves (13) enters the flow of the super-low liquid of pressurization gasifier (20), the pressure in tank car (1)
It constantly increases, the pressure P in the tank car (1) that first pressure sensor (5) detects1Reach 0.4MPa~0.8MPa, simultaneously
When dynamic amount Δ P meets the following conditions, opens the first valve (10), unloading pump (7) is pre-chilled:
Ps=(λ L/d) ρ v2/2；
Δ P=P1- P=P2-1+Ps；
In formula:
P2-1--- theoretical pressure difference, unit MPa；
P --- the pressure in storage tank, unit MPa；
Ps--- the pressure loss, unit MPa；
The density of ρ --- fluid, unit kg/m3；
ν12--- the speed of tank car liquid outlet fluid, unit m/s；
ν22--- the speed of unloading pump inlet fluid, unit m/s；
ν --- pipeline fluid speed, unit m/s；
gZ1--- the position energy of tank car liquid outlet, unit m2/s2；
gZ2--- the position energy of unloading pump inlet, unit m2/s2；
λ --- pipeline frictional resistant coefficient；
L --- duct length, unit m；
D --- internal diameter of the pipeline, unit m；
When meeting following two condition simultaneously, starting unloading pump (7) is unloaded:
Dynamic amount Δ P=P1- P=P2-1+Ps；
And the first temperature T that detects of temperature sensor (8)1<-120℃；
While unloading, by adjusting the opening and closing degree of the second valve (13), keep some ultra-low geothermal liquid flowed out in tank car logical
It crosses liquid phase branch (17) to be introduced into pressurization gasifier (20) to tank car pressurization, and controls pressurization gasifier (20) outlet second temperature
The temperature that sensor (22) detects meets the following conditions:
P3=∑ yiPci；
Tc=∑ yiTci；
Δ T=T2-Tc；
Δ T is 278K~298K；
In formula: Ai, Bi, Ci, yi are constant, look into " deep cooling handbook "；
P3--- the pressure that third pressure sensor detects, unit MPa；
Pci--- Various Components In Natural Gas pressure caused by saturation state steam, unit MPa；
Tci--- Various Components In Natural Gas possessed temperature in saturation state, unit K；
Tc——P3The saturation temperature of lower super-low liquid, unit K；
T2--- the temperature that second temperature sensor detects；
It maintains dynamic to measure Δ P simultaneously and meets the following conditions:
Dynamic amount Δ P=P1- P=P2-1+Ps。
7. technique according to claim 6, which is characterized in that further include: when storage tank be storage tank with pressure when, step 2 it
Before, the pressure difference of storage tank Yu tank car (1) is first judged after the completion of nitrogen displacement, when the pressure P in storage tank is sensed greater than first pressure
The pressure P in tank car (1) that device (5) detects1When, the 4th valve (16) is opened, balances tank car (1) by gas phase pipeline (18)
The 4th valve (16) is closed after pressure balance with the pressure of storage tank.
8. technique according to claim 7, which is characterized in that the storage tank with pressure is that finger pressure is 0.4MPa~1.0MPa
Storage tank.
9. technique according to claim 6, which is characterized in that further include: by detecting each list of unloading during unloading
The tank car pressure of member controls the pressure balance between each tank car, when the tank car hypotony of some unit of unloading, opens
The third valve (15) of unit of unloading where the higher tank car of pressure, the portion gas in tank car for keeping pressure high is successively through gas
Phase pipeline (18), gas phase branch (14) and tank car gas phase pipe (25) enter in the tank car of the unit of unloading of other hypotony, right
The tank car of hypotony is pressurized.
10. technique according to claim 6, which is characterized in that further include: unloading pump (7) and phase are closed after unloading
Valve is answered, the 4th valve (16) is opened, the pressure of tank car (1) and storage tank is balanced by gas phase pipeline (18).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145684A (en) * | 2019-05-31 | 2019-08-20 | 中国空分工程有限公司 | A kind of low-temperature storage tank chilldown system and forecooling method |
| CN112555676A (en) * | 2020-12-10 | 2021-03-26 | 陕西融科低温设备有限公司 | Ultra-low temperature liquid pressurization unloading device and method |
| CN113375050A (en) * | 2021-05-26 | 2021-09-10 | 江苏大洋海洋装备有限公司 | Liquefied gas ship gas test combination device |
| CN117111538A (en) * | 2023-10-24 | 2023-11-24 | 苏州致邦能源装备有限公司 | Control system for unloading process of gas storage tank |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009103165A (en) * | 2007-10-22 | 2009-05-14 | Taiyo Nippon Sanso Corp | Low temperature liquefied gas transport vehicle |
| CN201672248U (en) * | 2010-05-27 | 2010-12-15 | 成都华气厚普机电科技有限责任公司 | Unloading charging device for LNG |
| CN102635783A (en) * | 2012-04-11 | 2012-08-15 | 重庆巨创计量设备股份有限公司 | Safe energy-saving LNG (Liquefied Natural Gas) skid-mounted filling station |
| CN103411128A (en) * | 2013-03-21 | 2013-11-27 | 宁波明欣化工机械有限责任公司 | Integrated storage tank supercharge and gasification sledge |
| CN103527924A (en) * | 2013-04-26 | 2014-01-22 | 洛阳新奥华油燃气有限公司 | Precooling method before unloading of LNG (Liquefied Natural Gas) tank wagon |
| CN105020577A (en) * | 2015-07-29 | 2015-11-04 | 重庆耐德能源装备集成有限公司 | LNG unloading method capable of achieving accurate measurement and LNG unloading measurement device |
| CN106195622A (en) * | 2016-08-31 | 2016-12-07 | 河南开元气体装备有限公司 | Novel LNG tank car unloading pump skid is put |
| CN107327699A (en) * | 2017-08-12 | 2017-11-07 | 连云港市拓普科技发展有限公司 | Intelligent integral packaged type LNG unloads sled |
| CN207298367U (en) * | 2017-09-04 | 2018-05-01 | 连云港杰瑞自动化有限公司 | A kind of skid of unloading with low-temperature centrifugal pump with the LNG for being pressurized gasifier is put |
| CN208011288U (en) * | 2018-02-01 | 2018-10-26 | 荣盛达（无锡）能源有限公司 | A kind of LNG tank cars unloading system |
-
2019
- 2019-02-19 CN CN201910122221.9A patent/CN109707999B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009103165A (en) * | 2007-10-22 | 2009-05-14 | Taiyo Nippon Sanso Corp | Low temperature liquefied gas transport vehicle |
| CN201672248U (en) * | 2010-05-27 | 2010-12-15 | 成都华气厚普机电科技有限责任公司 | Unloading charging device for LNG |
| CN102635783A (en) * | 2012-04-11 | 2012-08-15 | 重庆巨创计量设备股份有限公司 | Safe energy-saving LNG (Liquefied Natural Gas) skid-mounted filling station |
| CN103411128A (en) * | 2013-03-21 | 2013-11-27 | 宁波明欣化工机械有限责任公司 | Integrated storage tank supercharge and gasification sledge |
| CN103527924A (en) * | 2013-04-26 | 2014-01-22 | 洛阳新奥华油燃气有限公司 | Precooling method before unloading of LNG (Liquefied Natural Gas) tank wagon |
| CN105020577A (en) * | 2015-07-29 | 2015-11-04 | 重庆耐德能源装备集成有限公司 | LNG unloading method capable of achieving accurate measurement and LNG unloading measurement device |
| CN106195622A (en) * | 2016-08-31 | 2016-12-07 | 河南开元气体装备有限公司 | Novel LNG tank car unloading pump skid is put |
| CN107327699A (en) * | 2017-08-12 | 2017-11-07 | 连云港市拓普科技发展有限公司 | Intelligent integral packaged type LNG unloads sled |
| CN207298367U (en) * | 2017-09-04 | 2018-05-01 | 连云港杰瑞自动化有限公司 | A kind of skid of unloading with low-temperature centrifugal pump with the LNG for being pressurized gasifier is put |
| CN208011288U (en) * | 2018-02-01 | 2018-10-26 | 荣盛达（无锡）能源有限公司 | A kind of LNG tank cars unloading system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145684A (en) * | 2019-05-31 | 2019-08-20 | 中国空分工程有限公司 | A kind of low-temperature storage tank chilldown system and forecooling method |
| CN110145684B (en) * | 2019-05-31 | 2023-08-29 | 中国空分工程有限公司 | Precooling system and precooling method for low-temperature storage tank |
| CN112555676A (en) * | 2020-12-10 | 2021-03-26 | 陕西融科低温设备有限公司 | Ultra-low temperature liquid pressurization unloading device and method |
| CN113375050A (en) * | 2021-05-26 | 2021-09-10 | 江苏大洋海洋装备有限公司 | Liquefied gas ship gas test combination device |
| CN117111538A (en) * | 2023-10-24 | 2023-11-24 | 苏州致邦能源装备有限公司 | Control system for unloading process of gas storage tank |
| CN117111538B (en) * | 2023-10-24 | 2024-01-05 | 苏州致邦能源装备有限公司 | Control system for unloading process of gas storage tank |
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